CVE-2026-9733

CRITICALPre-NVD 9.19.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-23. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory

Also known asEUVD-2026-38421 (ENISA EUVD) · GHSA-rq65-66g5-5pg2 (GitHub Security Advisories)Source: ENISA EUVD

9.1EG
EchelonGraph verdictPlan mitigationNo release containing the referenced fix is confirmed: check the referenced fix and the vendor's advisory for a release that contains it; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

Mojolicious::Plugin::Web::Auth::OAuth2 versions through 0.17 for Perl have an insecure default state parameter.

When no state generator is specified in the constructor, the module defaults to using a SHA-1 hash of predictable and low-entropy sources, including the epoch time (which is leaked via the HTTP Date header) and a call to Perl's built-in rand function.

A predictable state allows an attacker to hijack another user's session through cross site request forgery (CSRF).

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
56
EG Risk 56/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity91% × 45%
Impact severity (EG Severity): CVSS 9.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
44th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.1): severity, escalated by confirmed exploitation. This CVE's 9.1 is its impact severity (EG Severity), not escalated.

EG Severity
9.1 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

June 23, 2026

Last Modified

October 25, 2026

Advisory Details (4)

Auto-updated Sep 16, 2026
Fix referenced — no release confirmed yet.
Web page

oss-security - CVE-2026-9733: Mojolicious::Plugin::Web::Auth::OAuth2 versions through 0.17 for Perl have an insecure default state parameter

http://www.openwall.com/lists/oss-security/2026/06/23/1
Web page

RFC 6749 - The OAuth 2.0 Authorization Framework

https://datatracker.ietf.org/doc/html/rfc6749#section-10.12

Vendor Advisories for CVE-2026-9733(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 16× in last 7d / 64× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 512 rows on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 412 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 07:57 UTCEchelonGraph re-scored
  2. 2026-11-13 07:57 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  3. 2026-11-12 16:35 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  4. 2026-11-12 10:08 UTCEchelonGraph re-scored
  5. 2026-11-12 10:08 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  6. 2026-11-11 16:41 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  7. 2026-11-11 12:14 UTCEchelonGraph re-scored
  8. 2026-11-11 12:14 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  9. 2026-11-10 16:46 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  10. 2026-11-10 14:24 UTCEchelonGraph re-scored
  11. 2026-11-10 14:24 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  12. 2026-11-09 16:37 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  13. 2026-11-09 16:34 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  14. 2026-11-08 18:44 UTCEchelonGraph re-scored
  15. 2026-11-08 18:44 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  16. 2026-11-08 16:42 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  17. 2026-11-07 20:54 UTCEchelonGraph re-scored
  18. 2026-11-07 20:54 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  19. 2026-11-07 16:40 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  20. 2026-11-06 23:04 UTCEchelonGraph re-scored
  21. 2026-11-06 23:04 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  22. 2026-11-06 22:55 UTCOSV refresh
  23. 2026-11-06 16:40 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  24. 2026-11-06 01:15 UTCEchelonGraph re-scored
  25. 2026-11-06 01:15 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
Show 75 more
  1. 2026-11-05 16:39 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  2. 2026-11-05 03:25 UTCEchelonGraph re-scored
  3. 2026-11-05 03:25 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  4. 2026-11-04 16:37 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  5. 2026-11-04 05:36 UTCEchelonGraph re-scored
  6. 2026-11-04 05:36 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  7. 2026-11-03 16:49 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  8. 2026-11-03 07:46 UTCEchelonGraph re-scored
  9. 2026-11-03 07:46 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  10. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  11. 2026-11-02 09:55 UTCEchelonGraph re-scored
  12. 2026-11-02 09:55 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  13. 2026-11-01 16:36 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  14. 2026-11-01 12:06 UTCEchelonGraph re-scored
  15. 2026-11-01 12:06 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  16. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  17. 2026-10-31 14:15 UTCEchelonGraph re-scored
  18. 2026-10-31 14:15 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  19. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  20. 2026-10-30 16:26 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  21. 2026-10-29 18:37 UTCEchelonGraph re-scored
  22. 2026-10-29 18:37 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  23. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  24. 2026-10-28 20:47 UTCEchelonGraph re-scored
  25. 2026-10-28 20:47 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  26. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  27. 2026-10-27 22:56 UTCEchelonGraph re-scored
  28. 2026-10-27 22:55 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  29. 2026-10-27 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  30. 2026-10-27 01:03 UTCEchelonGraph re-scored
  31. 2026-10-27 01:03 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  32. 2026-10-26 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  33. 2026-10-25 23:28 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  34. 2026-10-25 16:36 UTCEchelonGraph re-scored
  35. 2026-10-25 16:36 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  36. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  37. 2026-10-25 13:48 UTCEchelonGraph re-scored
  38. 2026-10-24 18:46 UTCEchelonGraph re-scored
  39. 2026-10-24 18:46 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  40. 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  41. 2026-10-23 20:57 UTCEchelonGraph re-scored
  42. 2026-10-23 20:57 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  43. 2026-10-23 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  44. 2026-10-22 23:06 UTCEchelonGraph re-scored
  45. 2026-10-22 23:06 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  46. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  47. 2026-10-22 01:16 UTCEchelonGraph re-scored
  48. 2026-10-22 01:16 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  49. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  50. 2026-10-21 03:16 UTCEchelonGraph re-scored
  51. 2026-10-21 03:16 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  52. 2026-10-20 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  53. 2026-10-20 04:58 UTCEchelonGraph re-scored
  54. 2026-10-20 04:58 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  55. 2026-10-19 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  56. 2026-10-19 05:55 UTCEchelonGraph re-scored
  57. 2026-10-19 05:54 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  58. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  59. 2026-10-18 08:01 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  60. 2026-10-18 02:56 UTCEchelonGraph re-scored
  61. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  62. 2026-10-17 09:29 UTCEchelonGraph re-scored
  63. 2026-10-17 09:29 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  64. 2026-10-16 16:45 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  65. 2026-10-16 11:34 UTCEchelonGraph re-scored
  66. 2026-10-16 11:34 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  67. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  68. 2026-10-15 12:17 UTCEchelonGraph re-scored
  69. 2026-10-15 12:17 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  70. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  71. 2026-10-14 07:43 UTCEchelonGraph re-scored
  72. 2026-10-14 07:42 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1
  73. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  74. 2026-10-13 02:55 UTCEchelonGraph re-scored
  75. 2026-10-13 02:55 UTCGHSA enrichmentGHSA-rq65-66g5-5pg2 · GitHub severity CRITICAL · GitHub CVSS 9.1

Frequently asked(5)

What is CVE-2026-9733?
CVE-2026-9733 is a critical-severity vulnerability; its CVE record was published on June 23, 2026. Mojolicious::Plugin::Web::Auth::OAuth2 versions through 0.17 for Perl have an insecure default state parameter. When no state generator is specified in the constructor, the module defaults to using a SHA-1 hash of predictable and low-entropy sources, including the epoch time (which is leaked via…
When was the CVE record for CVE-2026-9733 published?
The CVE record for CVE-2026-9733 was published on June 23, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 25, 2026; the record at its source may have been updated since.
Is CVE-2026-9733 actively exploited?
CVE-2026-9733 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-9733?
CVE-2026-9733 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-9733?
A fix for CVE-2026-9733 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation. The vendor advisories EchelonGraph has for CVE-2026-9733 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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